<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>02-innerHTML拼接效率测试</title>
</head>
<body>
    <script>
        var d1 = +new Date();
        var str = '';
        for(var i =0; i < 1000; i++){
            document.body.innerHTML += '<div style="width:100px; height:2px; border:1px solid blue;"></div>';
        }
        var d2 = +new Date();
        console.log(d2 - d1);
    </script>
</body>
</html>